OF CONCHOLOGY. 



181 



ing the form of the aperture. In his last paper (Ann. and Mag. 

 June, 1868), Guppy observes as follows : 



*' It has been suggested to me that Conulus vacans, which I 

 described as occurring in Trinidad, is possibly the same as Steno- 

 jms lividus of Guilding. I had, however, made a careful com- 

 parison of Guilding's figure, and it seemed to me that the two 

 were distinct, although there can be little doubt that both mol- 

 lusks belong to the same group. I venture to think, however, 

 that, in view of their affinities, the name Conulus is the proper one 

 for the group. The name ^S^ife^opws cannot be allowed to stand, 

 having been preoccupied for a crustacean. Such shells as Conu- 

 lus semen-lim and C. Gundlachi are evidently not separable from 

 the present group. The mucus-pore and retractile appendage on 

 the truncate tail are found in the genus Nanina, and also in 

 Zonites (as described in ' Die Heliceen ' of Albers) ; and Conulus 

 vacans has also the median part of the foot defined as in Nanina 

 (e. g. Helicarion Freycineti), I think, therefore, that the best 

 classification will be to refer to Zonites all those species (of the 

 group now under consideration) in which a caudal appendage ex- 

 ists. Conulus will thus form a section of Zonites, comprising the 

 minutely perforated trochiform species. To the group ^gopis 

 will be assigned those species having shells like Stenopus cruen- 

 tatus, Guild., S. Gruildingi, Bland, ^^ndi Helix nitensoides^D'Ovh. 

 The genus Hyalina will then consist of the species such as H. 

 cellaria and H. nitens, which have no caudal appendage." 



I do not concur with the above suggestions as to classification ; 

 but time and space do not permit me to discuss them. I must, 

 however, remark that there is no evidence, so far as I know, of 

 the existence of a caudal appendage in C. Gundlachi. In the 

 allied shell C. fulva it does not occur. 



Morch (Jour, de Conch. 3 ser. vii, 256 (1867), with reference 

 to the resemblance of the teeth of Conulus vacans, as represented 

 by Guppy, to those of Testacella, proposes to establish the genus 

 Guppy a. 



11. Stenopus Guildingi, Bland. Ann. Lye. viii, 1865. 



Heights of Aripo, 2000 to 2700 feet.— Guppy. Also Porto 

 Gabello, Venezuela, B. Swift. 



Guppy refers shells found in Trinidad (at the above locality 

 only) to this species, which he puts in the genus Zonites, but he 

 admits having had no opportunity to examine the animal. He 

 remarks, " this shell is so like Hyalina cellaria, Miill., that, were 

 a dozen examples of each mixed together, it would be difficult to 

 assort them." This comparison is so much at variance with my 



